Proposal to establish a new UN Regulation on liquefied hydrogen storage systems (LHSS) for hydrogen-fuelled vehicles of categories M₂, M₃, N₂ and N₃, incorporating specifications for the LHSS, specific components including pressure relief devices and shut-off devices, and vehicle fuel system requirements with testing and approval procedures, based on GRSP/2025/41 and GRSP-78-15-Rev.1.